Greatly reduce the amount of build product we upload.
See #4462 for the gory details. Main things about this commit: - New 'monolithic' flag on cabal-install, which combines all of the tests into a single binary. It's not very much code, and you don't pay for any of it on a release build. I quite like it. The one downside is that we can't also pull in Cabal test suites this way. - Env vars got moved into travis-common.sh - travis-script.sh now runs the cabal-tests tests, because we aren't sending enough build product over to do them on the second Travis run Signed-off-by: Edward Z. Yang <firstname.lastname@example.org>
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